APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Huijie Wang,Qi Liu,Mengyang Xu,Chenlong Yan,Xianghai Song,Xin Liu,Huiqin Wang,Weiqiang Zhou,Pengwei Huo
The localized surface plasmon resonance (LSPR) effect has shown significant progress in enhancing the efficiency of light absorption and separating photogenerated carriers. Herein, the dual-plasma enhanced 2D/2D/2D g-C 3 N 4 /Pd/MoO 3-x (CPM) S-scheme heterojunction photocatalysts were synthesized using the method of hydrothermal and electrostatic self-assembly for high-selectivity photocatalytic reduction of CO 2 to produce CO. The dual LSPR effect of MoO 3-x and ultrathin Pd nanosheets synergistically broadened the optical response range of the CPM composites and successfully improved the photocatalytic activity and near-infrared (NIR) performance. The optimized CPM-30 photocatalysts exhibited CO yields of 18.55 μmol g −1 with a selectivity of 96.3%. In addition, the CO yield reached 3.92 μmol g −1 after 4 h of NIR light photoirradiation. The electron spin resonance (ESR) and ultraviolet photoelectron spectroscopy (UPS) tests showed that the S-scheme heterojunctions were constructed by coupling g-C 3 N 4 /Pd nanosheets and MoO 3-x . This work will provide a reference for improving product selectivity through the design of two-dimensional composites and the utilization of plasma materials.
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OPTICAL MATERIALS
·
2023
·
IF 3.9
Xiaoxia Ou,Pu Chen,Ke Zhao,Cunjie Xia
A novel ternary photocatalyst with a Z-scheme heterojunction was successfully synthesized through the deposition of Ag nanoparticles onto the surface of a ZnO/g-C 3 N 4 composite. The prepared photocatalysts were characterized by XRD , FT-IR, XPS , HRSEM, TEM , DRS, PL, EIS, TPC , and M-S. The photocatalytic performance of the as-synthesized photocatalysts was systematically investigated through the photodegradation of norfloxacin (NOR) and rhodamine B (RhB) under visible light irradiation. The photodegradation efficiency of 5% Ag/ZnO/g-C 3 N 4 (5AZCN) composite photocatalyst reached 86.7% (480 min) and 98.0% (60 min) for NOR and RhB, respectively. Moreover, the apparent rate constants of the 5AZCN composite photocatalysts for NOR and RhB were found to be 3.4 and 22.2 times higher than that of the ZCN composite photocatalysts, respectively. The significantly enhanced photocatalytic performance was ascribed to the widened range of visible light response and the efficient separation and migration of carriers facilitated by the introduction of Ag nanoparticles that functioned as electron transfer mediators. Based on the free radicals quenching experiment and electron spin resonance (ESR) spectroscopy characterization, superoxide radicals (·O 2 − ) were the main reactive species in the photodegradation process. Furthermore, the charge transfer process was proved to be a Z-scheme transfer mechanism. This work provides a promising approach to simply constructing novel efficient Z-scheme photocatalysts for the elimination of environmental pollutants.
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ANALYTICAL CHEMISTRY
·
2017
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IF 6.32
Xue Li,Lusheng Zhu,Yunlei Zhou,Huanshun Yin,Shiyun Ai
A novel photoelectrochemical (PEC) assay is developed for sensitive detection of protein kinase A (PKA) activity based on PKA-catalyzed phosphorylation reaction in solution and signal amplification strategy triggered by PAMAM dendrimer and alkaline phosphatase (ALP). In this strategy, it is noteworthy at this point that PKA phosphorylation was achieved in solution instead of on the surface of the electrode, which has advantages of the good contact in reactants and simple experimental procedure. For immobilizing the phosphorylated peptide (P-peptide) on electrode surface, graphite-like carbon nitride (g-C3N4) and titanium dioxide (TiO2) complex is synthesized and characterized, which plays a significant role for TiO2 conjugating phosphate groups and g-C3N4 providing PEC signal. Subsequently, PAMAM dendrimer and ALP can be captured on P-peptide and TiO2/g-C3N4 modified ITO electrode via interaction between the -COOH groups on the surface of PAMAM dendrimer and the -NH2 groups of peptide and ALP, which can lead to the increase of ALP amount on the modified electrode surface assisted with the PAMAM dendrimer. As a result, the amount of ALP catalyzes of L-ascorbic acid 2-phosphate trisodium salt (AAP) to produce electron donor of ascorbic acid (AA), resulting in an increased photocurrent. The proposed detection assay displays high selectivity and low detection limit of 0.048 U/mL (S/N = 3) for PKA activity. This biosensor can also be applied for the evaluation of PKA inhibition and PKA activity assay in cell samples. Therefore, the fabricated PEC biosensor is potentionally well in PKA activity detection and inhibitor screening.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Shasha Wang,Qing Wang,Wuxin Liu,Yan Wang,Yuli Wei,Shaohua Luo,Pengqing Hou,Yahui Zhang,Shengxue Yan,Xin Liu
Due to the advantages of abundant precursors, simple preparation, and environmental friendliness, nitrogen-doped carbon is considered one of the most potential anodes for potassium ion batteries (PIBs). Here, nitrogen-doped carbon materials (NC-2) were prepared by using secondary exfoliated g-C 3 N 4 as a precursor, combined with sucrose, and subjected to hydrothermal and high-temperature pyrolysis. NC-2 is characterized by high nitrogen content, porous layered structure, and large interlayer spacing. NC-2 used as anode of PIBs shows a high reversible capacity of 261.07 mAh g −1 at 0.1 A g −1 and an impressive rate performance of 153.36 mAh g −1 at 2 A g −1 . The impressive performance of NC-2 can be originated from the porous layered structure and enlarged interlayer spacing promotes the intercalation/deintercalation and the diffusion of K ions , and the defective carbon structure formed after nitrogen doping can supply abundant active sites for K ions. The results show that NC-2 has great potential in the field of PIBs anode.
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ANALYTICAL CHEMISTRY
·
2023
·
IF 7.4
Xingxing Jiang,Shuping Liu,Xianwen Song,Qiang Li,Minghui Yang,Xiang Chen
How to overcome the intrinsic low activity of most oxidase and peroxidase mimics at neutral pH has been extremely challenging. Herein, we represent a chromium-mediated and ligand-dependent strategy to activate the oxidase-like activity of boron-doped g-C3N4 (B-g-C3N4, denoted as BG), aiming at breaking the pH limitation. Cr (III) can be in situ oxidized to Cr (IV) by generated •O2– upon UV light irradiation, which then works as a catalysis mediator to oxidize TMB under a neutral environment. Excitingly, the TMB oxidation can be rationally modulated by ligands on the BG coordinating with chromium. We verify that the PEI-Cr3+ coordination outperformed Cit-PEI-Cr3+ on the oxidase-like activity through a more accelerated electron transfer, unveiled by the Gauss theoretical calculations. This study highlights a paradigm of tuning the coordination environment on nanozyme surface via the ligand engineering strategy for boosting the oxidase-mimicking activity and breaking the pH limitation. Meanwhile, the catalysis-based colorimetric assay for accurate and selective identification of Cr3+ was achieved.
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MICROCHIMICA ACTA
·
2023
·Vol. 191
·期 1
·1-12
·
IF 5.7
Liu Xinyu,Yu Yang,Xie Tianhua,Cao Zijin,Li Zhiyan,Li Yuejing,Gu Yingqiu,Han Caiqin,Yang Guohai,Qu Lulu
Monolayer g-C 3 N 4 -modified Au/Ag nanorods (g-C 3 N 4 /Au/Ag NRs) array is fabricated as a dual-function platform with high surface-enhanced Raman scattering (SERS) response and excellent photocatalytic degradation ability for bisphenol A (BPA) residues. FDTD simulation results of Au/Ag NRs proves that the electromagnetic field intensity is significantly enhanced at the gap of Ag NRs and Au NPs and the protrusion of Au NPs, which endows the arrays with excellent SERS activity. The arrays exhibit high sensitivity for rhodamine 6G (R6G) (LOD = 1.1 × 10 -11 mol/L) and high SERS enhancement (EF = 9.2 × 10 7 ). In addition, the g-C 3 N 4 /Au/Ag NRs could degrade ˃90% of BPA adsorbed on the substrate surface within 140 min under visible light irradiation, and maintains its SERS activity after repeated use for 4 times. The dual-function platform with high SERS response and excellent recycling capability is proved to be reliable and is very promising for monitoring of BPA residues in food. Graphical abstract
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Desen Zhou,Xuan Zhang,Zheng Li,Jun Zhang,Tielin Wang,Shaowen Cao
Photocatalytic conversion of CO 2 to usable fuels provides a new strategy for solving energy problems and the greenhouse effect. Porphyrin-based metal-organic frameworks (MOFs) are promising in photocatalysis due to their remarkable light harvesting ability, and the metal active site and its coordination environment can be further adjusted to achieve the high activity. In this work, g-C 3 N 4 /PCN-222 composites with different porphyrin metal centers were fabricated and the g-C 3 N 4 /PCN-222(Fe III ) catalyst showed the highest photocatalytic CO 2 reduction performance than that of g-C 3 N 4 /PCN-222(Fe II ) and other g-C 3 N 4 /PCN-222( M , M = Co, Ni, Cu, Zn) composites. Experimental studies and theoretical calculations showed that the axial coordination in g-C 3 N 4 /PCN-222(Fe III ) distorts the square planar field (Fe-N4) to quasi-octahedral coordination, which led to the moderate adsorption ability of CO 2 reduction intermediate (*CO), resulting in the high photocatalytic activity.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2023
·
IF 3.8
Tongming Su,Jundong Meng,Ya Xiao,Liuyun Chen,Hongbing Ji,Zuzeng Qin
Photocatalytic CO 2 reduction to valuable product exhibit promising prospect for solving the energy crisis and the greenhouse effect. Herein, Co-Ti 3 C 2 T x /g-C 3 N 4 (Co-TC/CN) composite with enhanced photocatalytic performance for converting CO 2 to CO and CH 4 was constructed by electrostatic self-assembly method. The close contact interface between Co-Ti 3 C 2 T x and g-C 3 N 4 nanosheets can be used as fast transport channels of photogenerated electrons and effectively promote the separation of photogenerated electrons and holes, and the interface between the Co and Ti 3 C 2 T x might be the active sites for CO 2 adsorption and activation. The optimized Co-Ti 3 C 2 T x /g-C 3 N 4 composite exhibited the highest photocatalytic performance with the CO and CH 4 production of 55.04 μmol·g –1 and 2.29 μmol·g –1 , respectively, which were 7.5 times and 5.9 times than those of g-C 3 N 4 . Furthermore, the stability of g-C 3 N 4 was improved after coupling with Co-Ti 3 C 2 T x .
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Sainan Wang,Chao Yuan,Wei Chen,Yifan Niu,Yexi Yan,Fan Li,Hongmei Jiang
A series of CuO@g-C 3 N 4 composites with different contents of g-C 3 N 4 and different morphologies of CuO have been designed and prepared by hydrothermal method and applied to activate peroxymonosulfate (PMS) for the removal 2,4,6-trichlorophenol (2,4,6-TCP). The results showed that 3D spherical shape CuO-1@g-C 3 N 4 -3, being able to activate PMS to produce a large amount of singlet oxygen ( 1 O 2 ), not only had good catalytic performance, but also reduced the dissolution of Cu 2+ . By comparing the morphological characteristics, catalytic performance, free radical species, decomposition rate of PMS and surface properties of three kinds of CuO, the generation mechanism of 1 O 2 and key reasons of CuO for producing 1 O 2 were deeply explored and finally deduced. Besides, under the conditions of initial pH 7.0, catalyst dosage 50 mg·L −1 , PMS dosage 0.3 mmol·L −1 and initial concentration of 2,4,6-TCP 10 mg·L −1 , the removal rate of 2,4,6,-TCP reached 94 % at 25 min in the first cycle, and 85 % in the fifth cycle. When CuO-1@g-C 3 N 4 was applied in actual water samples, 65 % of 2,4,6-TCP was removed in the Yangtze River, and 60 % of 2,4,6-TCP in Xuanwu and Yueya Lake in 40 min. Quenching experiments and electron paramagnetic resonance (EPR) were used to indentify active species during degradation process and the degradation intermediates of 2,4,6-TCP and possible degradation pathways were determined and proposed by high performance liquid chromatography-time of flight-mass spectrometry (HPLC-TOF-MS 2 ). This study shed light on the 1 O 2 generation mechanism of catalyst and provided theoretical basis and guidance for the design of 1 O 2 catalysts rich in non-radical active species.
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Shasha Wang,Qing Wang,Wuxin Liu,Yuli Wei,Yan Wang,Shaohua Luo,Pengqing Hou,Yahui Zhang,Shengxue Yan,Xin Liu
Carbon materials are still the most widely studied anode materials for potassium ion batteries (PIBs) attributed to their advantages of wide source, controllability, and environmental friendliness. In this paper, a bamboo-like tubular nitrogen-doped carbon material (CNC) was prepared by using g-C 3 N 4 as the precursor and transition metal salt as the catalyst and template. CNC has the advantages of a bamboo-like tubular structure, rich nitrogen content, and large layer spacing. As anode of PIBs, CNC can deliver an impressive initial reversible capacity of 488.6 mAh/g at 0.1 A/g. At a high current density of 1 A/g, CNC still retains a reversible capacity of 291 mAh/g after 1000 cycles. The excellent performance of CNC anode can be due to the porous bamboo-like tubular structure that promotes K ions diffusion and the rich nitrogen content that provides abundant active sites for K ions.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 24
·1-17
·
IF 2.8
Fan Yan,Wang Lei,Sun Xueqin,Li Cuili,Liu Jiacheng
A series of UiO-66-NH 2 -CA-Cu/g-C 3 N 4 (UCC 1 /CN x ) heterogeneous photocatalysts were constructed via a facile physical mixing treatment of the covalently post-modified MOF (UiO-66-NH 2 -CA-Cu) and functional materials g-C 3 N 4 . The tetracycline removal by the photocatalysis coupled with persulfate activation were studied under white light irradiation. The optimal UCC 1 /CN 20 photocatalyst showed the best photocatalytic performance, in which 94.0% TC could be efficiently eliminated ( k = 0.08669 min −1 ) within 30 min. The satisfactory degradation performance could be ascribed to the effective separation of photogenerated electron-hole pairs over the heterogeneous binary structure, which were demonstrated by several characteristic technologies including photoluminescence spectra, electrochemical impedance spectroscopy, transient photocurrent response and Bader charge analysis based on density functional theory calculations. Moreover, a possible mechanism behind the photocatalytic degradation was proposed and further affirmed by the quenching experiments and electron spin resonance measurements. Our work may supply a feasible idea for treating wastewater contained organic pollutants based on the heterogeneous photocatalyst.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Xiaoli Jin,Huiqing Wang,Xiongtao Lv,Qing Lan,Teng Ge,Lin Guo,Xin Li,Hongxian Sun,Chenghua Ding,Yuwei Guo,Haiquan Xie,Liqun Ye
The development of bifunctional photocatalysts for enhancing hydrogen (H 2 ) and hydrogen peroxide (H 2 O 2 ) production from water is essential in addressing environmental and energy issues. However, the practical implementation of photocatalytic technology is still constrained by the inadequate separation of photo-generated charge carriers. Herein, potassium (K) atoms are introduced into the interlayers of graphitic carbon nitride (g-C 3 N 4 ) with a hollow hexagonal structure (K-TCN) and are coordinated with N atoms in adjacent layers. The presence of K–N coordination serves as a layer bridge, facilitating the separation of charge carriers. The hollow hexagonal structure reduces the distance over which photogenerated electrons migrate to the surface, thereby enhancing the reaction kinetics. Consequently, the optimized K-TCN exhibits a dramatically improved photocatalytic H 2 (941.6 μmol g −1 h −1 with platinum (Pt) as the cocatalyst) and H 2 O 2 (347.6 μmol g −1 h −1 ) generation as compared to hollow g-C 3 N 4 (TCN) and bulk g-C 3 N 4 nanosheet (CN) without K–N bridge under visible light irradiation. The unique design holds promising potential for developing highly efficient bifunctional photocatalysts towards producing renewable fuels and value-added chemicals.
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